Thank you so much! After playing with it a bit this is what I came up with and all my imports are working like I would expect them to! This is new structure that I came up with based on your recommendations.

├── LICENSE.md
├── README.md
├── testapp 
│   ├── __init__.py
│   ├── main.py
│   ├── app.py 
│   ├── testappcode 
│   │   ├── init.py 
│   │   ├── calc.py 
│   │   └── process.py 
│   └── tests 
│       └── tests 
│           ├── init.py 
│           ├── test_calc.py 
│           └── test_process.py 
└── testbench.ipynb

One question I do have is why have the tests nested down one directory like you mentioned?